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% File src/library/utils/man/stack.Rd
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% File src/library/utils/man/stack.Rd
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% Part of the R package, https://www.R-project.org
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% Part of the R package, https://www.R-project.org
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% Copyright 1995-2011 R Core Team
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% Copyright 1995-2016 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\name{stack}
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\name{stack}
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\alias{stack}
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\alias{stack}
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\alias{stack.default}
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\alias{stack.default}
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  along with a factor indicating where each observation originated.
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  along with a factor indicating where each observation originated.
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  Unstacking reverses this operation.
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  Unstacking reverses this operation.
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}
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}
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\usage{
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\usage{
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stack(x, \dots)
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stack(x, \dots)
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\method{stack}{default}(x, \dots)
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\method{stack}{default}(x, drop=FALSE, \dots)
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\method{stack}{data.frame}(x, select, \dots)
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\method{stack}{data.frame}(x, select, drop=FALSE, \dots)
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unstack(x, \dots)
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unstack(x, \dots)
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\method{unstack}{default}(x, form, \dots)
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\method{unstack}{default}(x, form, \dots)
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\method{unstack}{data.frame}(x, form, \dots)
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\method{unstack}{data.frame}(x, form, \dots)
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}
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}
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    data frame.}
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    data frame.}
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  \item{form}{a two-sided formula whose left side evaluates to the
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  \item{form}{a two-sided formula whose left side evaluates to the
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    vector to be unstacked and whose right side evaluates to the
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    vector to be unstacked and whose right side evaluates to the
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    indicator of the groups to create.  Defaults to \code{\link{formula}(x)}
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    indicator of the groups to create.  Defaults to \code{\link{formula}(x)}
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    in the data frame method for \code{unstack}.}
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    in the data frame method for \code{unstack}.}
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  \item{drop}{Whether to drop the unused levels from the \dQuote{ind}
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    column of the return value.
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  }
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  \item{\dots}{further arguments passed to or from other methods.}
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  \item{\dots}{further arguments passed to or from other methods.}
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}
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}
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\details{
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\details{
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  The \code{stack} function is used to transform data available as
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  The \code{stack} function is used to transform data available as
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  separate columns in a data frame or list into a single column that can
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  separate columns in a data frame or list into a single column that can